Using a metric ruler student A measured the length of an object to
the nearest tenth (0.1) of a centimeter, while student D measured its
length to the nearest centimeter. Which measurement is more accurate?

I'm trying to do a project for school and it's a recipe for baking
cookies. In the recipe it calls for 500 grams of flour, 250 grams of
butter and so forth. I don't understand how to convert the
measurements, so I don't know how much to use. Can you please help?

On internet communities it is common to reduce figures using 'k' as a
shortcut; for example 2k is used instead of 2000. I was under the
impression that a number after the k (such as 2k4) meant 2400, and
that to get 2004 in this system you'd need to write 2k004. But I've
also seen 2k4 used for 2004. Which is correct? Does 2k4 mean 2004 or
2400?